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<FONT color="green">001</FONT>    package com.google.code.guava.base;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    /**<a name="line.3"></a>
<FONT color="green">004</FONT>     * Helper class for generating {@link RuntimeException RuntimeExceptions} from<a name="line.4"></a>
<FONT color="green">005</FONT>     * incoming Exceptions.<a name="line.5"></a>
<FONT color="green">006</FONT>     */<a name="line.6"></a>
<FONT color="green">007</FONT>    public final class Exceptions{<a name="line.7"></a>
<FONT color="green">008</FONT>    <a name="line.8"></a>
<FONT color="green">009</FONT>        /**<a name="line.9"></a>
<FONT color="green">010</FONT>         * Default message for generated {@link RuntimeException RuntimeExceptions}.&lt;br /&gt;<a name="line.10"></a>
<FONT color="green">011</FONT>         * Value: {@value}<a name="line.11"></a>
<FONT color="green">012</FONT>         */<a name="line.12"></a>
<FONT color="green">013</FONT>        public static final String DEFAULT_MESSAGE = "Unknown Error";<a name="line.13"></a>
<FONT color="green">014</FONT>    <a name="line.14"></a>
<FONT color="green">015</FONT>        /**<a name="line.15"></a>
<FONT color="green">016</FONT>         * Creates a {@link RuntimeException} with a message built using<a name="line.16"></a>
<FONT color="green">017</FONT>         * {@link String#format(String, Object...)}.<a name="line.17"></a>
<FONT color="green">018</FONT>         * <a name="line.18"></a>
<FONT color="green">019</FONT>         * @param message<a name="line.19"></a>
<FONT color="green">020</FONT>         *            the message template<a name="line.20"></a>
<FONT color="green">021</FONT>         * @param params<a name="line.21"></a>
<FONT color="green">022</FONT>         *            the template parameters<a name="line.22"></a>
<FONT color="green">023</FONT>         * @return a RuntimeException<a name="line.23"></a>
<FONT color="green">024</FONT>         */<a name="line.24"></a>
<FONT color="green">025</FONT>        public static RuntimeException create(final String message,<a name="line.25"></a>
<FONT color="green">026</FONT>            final Object ... params){<a name="line.26"></a>
<FONT color="green">027</FONT>            return createRuntimeException(null, message, params);<a name="line.27"></a>
<FONT color="green">028</FONT>        }<a name="line.28"></a>
<FONT color="green">029</FONT>    <a name="line.29"></a>
<FONT color="green">030</FONT>        static RuntimeException createRuntimeException(final Exception e,<a name="line.30"></a>
<FONT color="green">031</FONT>            final String message, final Object ... parameters){<a name="line.31"></a>
<FONT color="green">032</FONT>            final String expMessage;<a name="line.32"></a>
<FONT color="green">033</FONT>            if(message != null){<a name="line.33"></a>
<FONT color="green">034</FONT>                expMessage = String.format(message, parameters);<a name="line.34"></a>
<FONT color="green">035</FONT>            }else if(e != null){<a name="line.35"></a>
<FONT color="green">036</FONT>                expMessage = findMessageInExceptionTree(e);<a name="line.36"></a>
<FONT color="green">037</FONT>            }else{<a name="line.37"></a>
<FONT color="green">038</FONT>                expMessage = Exceptions.DEFAULT_MESSAGE;<a name="line.38"></a>
<FONT color="green">039</FONT>            }<a name="line.39"></a>
<FONT color="green">040</FONT>            return new IllegalStateException(expMessage, e);<a name="line.40"></a>
<FONT color="green">041</FONT>        }<a name="line.41"></a>
<FONT color="green">042</FONT>    <a name="line.42"></a>
<FONT color="green">043</FONT>        private static String findMessageInExceptionTree(final Exception e){<a name="line.43"></a>
<FONT color="green">044</FONT>            Throwable current = e;<a name="line.44"></a>
<FONT color="green">045</FONT>            while(current.getMessage() == null){<a name="line.45"></a>
<FONT color="green">046</FONT>                if(current.getCause() == null){<a name="line.46"></a>
<FONT color="green">047</FONT>                    break;<a name="line.47"></a>
<FONT color="green">048</FONT>                }else{<a name="line.48"></a>
<FONT color="green">049</FONT>                    if(current.getCause() == current){<a name="line.49"></a>
<FONT color="green">050</FONT>                        // sanity check<a name="line.50"></a>
<FONT color="green">051</FONT>                        break;<a name="line.51"></a>
<FONT color="green">052</FONT>                    }<a name="line.52"></a>
<FONT color="green">053</FONT>                    current = current.getCause();<a name="line.53"></a>
<FONT color="green">054</FONT>                }<a name="line.54"></a>
<FONT color="green">055</FONT>    <a name="line.55"></a>
<FONT color="green">056</FONT>            }<a name="line.56"></a>
<FONT color="green">057</FONT>            return current.getMessage() == null<a name="line.57"></a>
<FONT color="green">058</FONT>            ? Exceptions.DEFAULT_MESSAGE<a name="line.58"></a>
<FONT color="green">059</FONT>            : current.getMessage();<a name="line.59"></a>
<FONT color="green">060</FONT>        }<a name="line.60"></a>
<FONT color="green">061</FONT>    <a name="line.61"></a>
<FONT color="green">062</FONT>        /**<a name="line.62"></a>
<FONT color="green">063</FONT>         * Create a {@link RuntimeException} that wraps the supplied exception. The<a name="line.63"></a>
<FONT color="green">064</FONT>         * exception's message will be the first non-null message found in the<a name="line.64"></a>
<FONT color="green">065</FONT>         * exception hierarchy of the supplied exception, or<a name="line.65"></a>
<FONT color="green">066</FONT>         * {@link #DEFAULT_MESSAGE} if no such message can be found.<a name="line.66"></a>
<FONT color="green">067</FONT>         */<a name="line.67"></a>
<FONT color="green">068</FONT>        public static RuntimeException rethrow(final Exception exp){<a name="line.68"></a>
<FONT color="green">069</FONT>            return rethrow(exp, null);<a name="line.69"></a>
<FONT color="green">070</FONT>        }<a name="line.70"></a>
<FONT color="green">071</FONT>    <a name="line.71"></a>
<FONT color="green">072</FONT>        /**<a name="line.72"></a>
<FONT color="green">073</FONT>         * Create a {@link RuntimeException} that wraps the supplied exception. The<a name="line.73"></a>
<FONT color="green">074</FONT>         * exception's message will be created by applying<a name="line.74"></a>
<FONT color="green">075</FONT>         * {@link String#format(String, Object...)} on the &lt;code&gt;message&lt;/code&gt;<a name="line.75"></a>
<FONT color="green">076</FONT>         * parameter and the optional supplied parameters, if &lt;code&gt;message&lt;/code&gt;<a name="line.76"></a>
<FONT color="green">077</FONT>         * is not null. If the &lt;code&gt;message&lt;/code&gt; parameter is null, the first<a name="line.77"></a>
<FONT color="green">078</FONT>         * non-null message found in the exception hierarchy of the supplied<a name="line.78"></a>
<FONT color="green">079</FONT>         * exception will be used, or {@link #DEFAULT_MESSAGE} if no such message<a name="line.79"></a>
<FONT color="green">080</FONT>         * can be found.<a name="line.80"></a>
<FONT color="green">081</FONT>         */<a name="line.81"></a>
<FONT color="green">082</FONT>        public static RuntimeException rethrow(final Exception e,<a name="line.82"></a>
<FONT color="green">083</FONT>            final String message, final Object ... parameters){<a name="line.83"></a>
<FONT color="green">084</FONT>            return createRuntimeException(e, message, parameters);<a name="line.84"></a>
<FONT color="green">085</FONT>        }<a name="line.85"></a>
<FONT color="green">086</FONT>    <a name="line.86"></a>
<FONT color="green">087</FONT>        private Exceptions(){}<a name="line.87"></a>
<FONT color="green">088</FONT>    <a name="line.88"></a>
<FONT color="green">089</FONT>    }<a name="line.89"></a>




























































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